EP 1511164 A2 20050302 - Linear motor with reduced cogging force
Title (en)
Linear motor with reduced cogging force
Title (de)
Linearmotor mit reduzierter pulsierender Kraft
Title (fr)
Moteur linéaire avec faible pulsation de force
Publication
Application
Priority
JP 2003307788 A 20030829
Abstract (en)
There is provided a linear motor in which the shape of magnetic pole surfaces of pole teeth located at both ends of a plurality of pole teeth can be easily formed to be suitable for reducing cogging force. Each of magnetic pole surfaces 19a of pole teeth 15A located at both ends of a plurality of pole teeth 15 is constituted by an arc-shaped curved surface so curved that a gap from a stator 1 increases with increasing distance from other adjacent pole tooth 15B. Through holes 23A and 23B that extend in the laminating direction of electromagnetic steel plates 10 are formed in the vicinity of the magnetic pole surfaces 19a of the pole teeth 15A. Inside the through holes 23A and 23B, magnetic pieces shorter than the thickness of the electromagnetic steel plates in their laminating direction are so arranged as to leave spaces at both ends of the through holes 23A and 23B. <IMAGE>
IPC 1-7
IPC 8 full level
H02K 41/02 (2006.01); H02K 41/03 (2006.01)
CPC (source: EP KR US)
H02K 15/03 (2013.01 - KR); H02K 33/18 (2013.01 - KR); H02K 41/031 (2013.01 - EP KR US)
Citation (applicant)
- WO 0001059 A1 20000106 - SIEMENS AG [DE], et al
- JP 2002209371 A 20020726 - YASKAWA ELECTRIC CORP
- US 4638192 A 19870120 - VON DER HEIDE JOHANN [DE]
Designated contracting state (EPC)
CH DE FR GB IT LI
DOCDB simple family (publication)
EP 1511164 A2 20050302; EP 1511164 A3 20051207; EP 1511164 B1 20150701; CN 100521469 C 20090729; CN 1592051 A 20050309; KR 101072854 B1 20111014; KR 20050021891 A 20050307; US 2005046281 A1 20050303; US 6949846 B2 20050927
DOCDB simple family (application)
EP 04255214 A 20040827; CN 200410074840 A 20040830; KR 20040067831 A 20040827; US 92550704 A 20040825